The force said in a statement: “We are urgently conducting a review to understand whether there is any risk to the criminal justice process and to take remedial action where necessary.

“All victims in the affected cases have been contacted, where it has been deemed appropriate to do so.”

All the work of the scientist, who was suspended on March 26, has been audited and the Met said it is “satisfied that there are no other instances of undeclared casework”.

The case comes amid a national crisis in forensic services, following the closure of the publicly owned Forensic Science Service in 2012.

Techniques including analysis of DNA, fingerprints and digital evidence play a major role in a range of criminal investigations and the move forced police forces to either bring the services in-house or use private providers.